run some injector cleaner through fuel system
ive had a few do this and its due to carbon build up on the end/nozzle of injector
if its a 2.0 tdi then it may need injectors
prefix d and m are the ones at fault

injector loom problem mate im going to change mine it happens because the injector loom wiring overheats and melts because the wiring is runnin so close to the cars head where the boiling hot engine oil is which causes the injector to nozzle and injector to work sluggish showing the cylinder as if its going down but its usually just the loom but if your unlucky then you may need to do the head/full injector

Run injector cleaner, check all connections are clean and getting a good contact on the injectors. Other then that the solinods on the injectors are probably starting to die which means new injector/injectors.

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